For mobility enthusiasts amongst you who are living and/or working in Germany, there is something you should definitely check out: the Mobilithek, an open mobility data exchange platform hosted and maintained by the German government (Federal Ministry for Digital and Transport, BMDV). You can find it here: https://www.mobilithek.info. It is a B2B platform where data providers and data consumers can find matching connections.
While it is in an early stage, it is certainly worth a visit, and you will see more and more data being provided there down the road.